Sewing machine



Nov. 23 1926. 1,608,244 J. SCHREIBER SEWING MACHINE- original med Mav 21, 1921 2 sheets-sheet 1 /7/25 /7 o/we Nov. .23 1926.

J. SCHREIBER SEWING MACHINE Original Filed MBV 2l, 1921 Patented Nov. 23, 1926.

JOI-IN SCHREIBEB., 0F ST. LGUES, EISSOUR.

SEWNG MAC-INE.

rlhis invention relates to sewing machines and has special reference to mechanism for feeding a loclred thread throughthe loop of one thread that has been passed through the loopof another thread to loch the looped threads together.

An object of the invention is to provide an improved locked thread feeding mechanism specially adapted for use in a machine of the type disclosed in my prior application Serial No. 471,314, filed May 21, 1921, patented January 2, 1923, No. 1,440,556, in. which said application and patent the present invention is disclosed and from which it u is divided. Although the present invention is specially adapted for use in thD machine disclosed in my said prior application, 1 do not restrict myself to the use of the invention in that embodiment alone but desire to claim the invention wherever used.

The broad object of the invention is to provide mechanism for use in machines in which the stitches are formed from a loop passing through a puncture in the layers of 5 material to be united. with the second loop inserted through the first-named loop on the side of the material opposite from its point of entry, and lock thread inserted in the second loop to lock the two loops together when the stitch is drawn within the material so as to protect it from wear.

Other objects will appear from the following description, reference being made to the drawings in which- Fig. 1 is a side elevation of the frame supporting the loclr thread feeding device and the operating mechanism therefor.

Fig. 2 is ay vertical sectional view of the lock thread feeding mechanism.

Fig. 3 is a plan view of the loclr thread feeding mechanism,

Fig. 4 is a front elevation of the same mechanism with the front cover plate removed.

Fig. 5 is an enlarged fragmentary plan view of a portion of the lock thread feeding device.y

The lock thread 1 is operated by mechanism supported within a frame 2. A main operating shaft 3 has an arcuate rack and gear segment 4 attached thereto for imparting intermittent movements to the loclr thread feeding mechanism. The lock thread feeding mechanism is operated by a shaft 5 atent No. 1,440,556, dated January 2,

1922. Serial No. 607,532.

having a pinion 6 attached thereto with which the rack or segment 4 meshes inter mittently as the shaft 3 continuously rotates. rfhe shaft 5 is composed of two axially alined portions coupled by a sleeve 7 enclosing the adjacent ends of both portions of the shaft 5 and permitting the lock thread feeding mechanism and the frame 2 supporting it to be withdrawn easily without removing the other portion of the shaft 5. For this purpose that portion of the shaft 5 which eX` tends into the frame 2 is slidable within a frame or sleeve 7.

rEhe thread 1 passes through a channel 8 to feeding device. rlhe feeding device for the loch thread 1 comprises a ring 9 having a circumferential flange 10 the periphery of which is provided with ribs arranged obliquely tothe side edges to obtain better engagement with the thread 1 and to pass the thread along through a channel 11 (Fig. 2) bciow the plane of the needle slot 12 formed through the worlr supporting plate 13. The feeding device thus formed is supported so that the flange 10 engages the thread 1 passingv from the channel 8, and as the feeding device is turned in its support the thread 1 is passed therefrom through the channel 11 to position to perform its function.

The ring 9 of the feeding device is within a support 14 having an opening somewhat greater than the diameter of the ring 9. The iiange 10 of the thread feeding device is between the support 14 and a plate 15, forming part of the housing of the feeding mechanism. A spring 16 (Figs. 2 and 4) in the frame yiel'dingly 'supports the feeding device and presses the same to the position shown in Fig. 4, so as to engage and feed the thread 1 properly when the feeding device is rotated. From the channel 8 the thread 1 passes upwardly between the pcriphery of the flange 10 and the adjacent wall of the support for the feeding device.

14s a result of this the sarin 16 causes the ribbed peripheral surface of the flange 10 to move the thread 1 around about onefourth of the circumference of the feeding device and thence into the curved channei 11. A short rotary movement is imparted to the feeding device 9 1() by each inter1N mittent rotary7 movement of the shaft 5 and the means for edccting tiis movement Iof the feeding device will now be described.

The ringt) is provided with an internal circumferential series of ratchet teeth 17. A pawl 18 is pivotally supported on a projection 19 from a vertically movable slide 2() and is presse-d into engagement with the ratchet teeth 17 by a spring 21. During downward movement of the slide 2() the pawl 18 escapes over the teeth 17, but leaving the feeding device 9 1() stationary. Upward movement of the slide 20 imparts a short rotary movement to the feeding device 9 1() sufficient to pass the 'desired length of the thread 1 beyond the channel 11 and bel-ow the plane of the needle slot 12. The slide 2O supports rollers 22, one of which engages a cam 23 and the other of which engages a cam 24, both ef which cams are attached to the forward detachable end portion of the jointed shaft 5. The cams 23 and 2li are constructed and arranged to impart vertical reciprocating movements to the slide 20, with the result that the thread feeding device 9 1() is intermittently' rotated. After the thread 1 has been advanced to effective position and has been raised into a vertically widened portion 25 of the channel 11, the thread is cut to leave the end portion thereof in and as a part of a stitch. i

The knife 26 for cutting off the end portion of the thread 1 after each movement of the thread by the feeding device 9 1() is supported by a sli'de 27 arranged for vertical sliding movements similar to the slide 20. The upper portion of the slide 27 has a roller 28 operating against the cam 24 and the lower portion of the slide 27 has a roller 29 operating against a cam 30 on the shaft 5.

As before stat-ed upward movement of the slide 2O operates the thread fee-ding device 9 1() to pass the end of the thread 1 to effective position below the slot 12. After the thread has been advanced and extended to effective position the sli-de 27 is raised operating the knife 26 against the inner surface of the upper portion of the plate 15 and against the inner edge of the cover 31 of the housing. The vertically widened portion 25 of the channel 11 is within the cover plate 31. Upward movement of the knife 26 against the inner surfaces of the plates 15 and 31 is sufficient to cut the thread 1, after which the slide 2'? is moved downwardly to carry the knife 26 below the lower wall of the channel 11, leaving the thread 1 free to be moved at the neat operationof the feeding device 9 10. A spring 32 may be utilized to press the knife 26 against the plates 15 and 81.

rlhe stitch forming mechanism for utilizing the severed ends of the thread 1 constitutes thesubject-matter of my prior application before mentioned from which application the present case is divided. Therefore, the subject-matter of my said prier application is not shown or described in cletail in this case.

From the foregoing it will be seen that my invention is sufficient and satisfactory for its intended purpose It may be varied within equivalent limits without departure from the nature and principle of the invention. l do not restrict myself unessentially,

but what I claim and desire te secure by Letters iatent is y 1. ln a machine of the character described, the combination of a thread guide, a shaft, a roll supported independently of said shaft, a fiange on the roll for engaging the thread, a spring for pressing said roll to position to cause said flange to grip the thread, a pawl engaging said roll, and mechanism operated by said shaft for operating said pawl and thereby imparting intermittent and progressive rotary movements to said roll to rotate said roll in one direction only.`

2. ln a machine of the character described,

the combination of a thread guide, a shaft,

shaft, a roll, means independent of said shaft for supporting said roll, a spring for pressing the roll to position to grip the thread in said guide, a pawl engaging said roll, a movable slide supporting said pawl, means operated by said shaft for operating said slide to cause said pawl to impart intermittent and progressive rotary movements to said roll to rotate said roll in one direction only, a knife, and means operated by said shaft for operating said knife to cut the thread.

4. In a machine of the character described, a thread guide, an annular rotary feed device for feeding the thread .through said guide, ratchet teeth on said feed device, a support mounted for reciprocating movements, a pawl 0n said support engaging said ratchet teeth, and means for reciprocating said support tocause said pawl to .impart intermittent rotary movements to said feed device.

,5. In a machine of the character described, a thread guide, a rotary feed device for feeding thread through said guide, ratchet teeth on said feed device, a shaft, means for imparting intermittent rotary movements to said shaft, a support, means operated by said shaft for reciprocating said support, and a paWl carried by said support engaging the ratchet teth on said feed device for imparting intermittent rotary movements to said feed device.

6. In a machine of the character described, a thread guide, a ring, a circumferential flange in connection with said ring, ribs on the periphery of said flange for engaging the thread, ratchet teeth supported by said ring, a reciprocating support, a pawl mounted onV said support for engaging said ratchet teeth to impart rotary movements to said ring and flange, and mechanism for reciprocating said support.

7. In a machine of the character described, a thread guide, a ring, a circumfen ential flange in connection with said ring, ribs on the periphery of said flange for engaging the thread, ratchet teeth supported. by said ring, a reciprocatinov support, a pawl mounted on said support for engaging said ratchet teeth to impart rotary movements to said ring and flange, a shaft, cams on said shaft, and elements supported by said support engaging said cams for reciprocating said support when said shaft is rotated.

8. In a machine of the character described, a thread guide, a ring, a circumferential iange in connection With said. ring, ribs on the periphery of said flange for engaging the thread, ratchet teeth supported by said ring, a reciprocating support, a paivl mounted on Said support for engaging said ratchet teeth to impart rotary movements to said ring and flange, a shaft, cams on said shaft, elements supported by said support engaging said cams for reciprocating said support When said shaft is rotated, and means for imparting intermittent rotary movements to said shaft.

9. In a machine of the character described, a thread guide, a rotary feed device for feeding thread through said guide, ribs on the periphery of said feed device for engaging the thread, a spring for pressing the feed device to position to engage the thread, an intermittently rotating shaft, and mechanism operated by said shaft for imparting intermittent rotary movements to said feed device.

10. In a machine of the character described, a thread guide, a rotary feed device for feeding thread through said guide, ribs on the periphery of said feed device for engaging the thread, a spring for pressing the feed device to position to engage the thread, an intermittently rotating shaft, cams on said shaft, a reciprocating support operated by said cams, and means operated by said support for imparting intermittent rotary movements to said feed device.

l1. In a machine of the character described, the combination of a thread guide, a feed device for passing thread through said guide, a spring for pressing the feed device to position to engage the thread, an intermittently rotating shaft, mechanism operated by said shaft for imparting intermittent rotary movements to said feed device, a knife for cutting the thread that has passed through said guide, and mechanism operated by said shaft for operating said knife to cut the thread.

JOHN SCHREIBER. 

